CN103695599B - Low-alloy steel CBM20 microalloying method - Google Patents
Low-alloy steel CBM20 microalloying method Download PDFInfo
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- CN103695599B CN103695599B CN201310690888.1A CN201310690888A CN103695599B CN 103695599 B CN103695599 B CN 103695599B CN 201310690888 A CN201310690888 A CN 201310690888A CN 103695599 B CN103695599 B CN 103695599B
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Abstract
In order to solve the problems of internal porosity, excessive internal microcrack defects, low flaw detection percentage of pass and the like existing in low-alloy steel CBM20 in the prior art, the invention provides a low-alloy steel CBM20 microalloying method. The method comprises the steps: preparing a low-alloy steel CBM20 steel ingot by using an electric arc furnace (EF), an LF (Ladle Refining) process, a VD (Vacuum Distillation) ladle refining furnace and a die casting process; adding Fe-V and Fe-B to a ladle after carrying out vacuum treatment by using the VD ladle refining furnace; stirring by using argon gas; and then, casting to form an ingot. The low-alloy steel CBM20 microalloying method provided by the invention has the beneficial technical effects that the internal porosity and the number of the internal microcrack defects of the CBM20 steel ingot can be effectively reduced, the high-temperature strength and compactness of the low-alloy steel CBM20 are effectively improved, and the flaw detection percent of pass obtained after the low-alloy steel CBM20 is processed is increased to over 95%.
Description
Technical field
The present invention relates to a kind of low-alloy steel micro-alloying technology, be related specifically to a kind of low-alloy steel CBM20 microalloying method.
Background technology
The structural alloy steel of my company of low-alloy steel CBM20 system exploitation, due to it, to have processing thermoplastic good, the characteristics such as mechanical tenacity is high, the production of all kinds of axle and axle sleeve parts after being widely used in case-carbonizing process.Because the alloy content of CBM20 material is lower, its typical composition is weight percentage C0.15 ~ 0.17, Mn0.75 ~ 0.80, Si0.24 ~ 0.28, S0.004 ~ 0.006, P0.005 ~ 0.015, Cr1.10 ~ 1.15, Mo0.26 ~ 0.28, V0.04 ~ 0.06, its carbon content is positioned near peritectic point, in its cooled and solidified process, the tissue defects such as the loose and internal tiny crack of easy formation, make its elevated temperature strength lower and not fine and close.Usually, after machining, its flaw detection qualification rate is always about 50%, and major ABO incompatibility lattice reason is that internal defect and internal tiny crack defect exceed standard.Obviously, the problems such as prior art low-alloy steel CBM20 there is internal defect and internal tiny crack defect exceeds standard, and flaw detection qualification rate is lower.
Summary of the invention
For the internal defect and internal tiny crack defect that solve prior art low-alloy steel CBM20 existence exceed standard, the problems such as flaw detection qualification rate is lower, the present invention proposes a kind of low-alloy steel CBM20 microalloying method.Low-alloy steel CBM20 microalloying method of the present invention, electric arc furnaces EF+ refining LF+VD type ladle refining furnace+die casting process is adopted to prepare low-alloy steel CBM20 steel ingot, it is characterized in that, after the application of vacuum of VD type ladle refining furnace, vanadium iron Fe-V and ferro-boron Fe-B is added in ladle, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low-alloy steel CBM20 is weight percentage C0.15 ~ 0.17, Mn0.75 ~ 0.80, Si0.24 ~ 0.28, S0.004 ~ 0.006, P0.005 ~ 0.015, Cr1.10 ~ 1.15, Mo0.26 ~ 0.28, V0.04 ~ 0.06;
Describedly in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, comprise, after VD application of vacuum, in ladle, add Fe-V50 and Fe-B; Addition 0.8 ~ 1.2kg/ ton molten steel of its Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel.
Further, low-alloy steel CBM20 microalloying method of the present invention, comprises the following steps:
S1, employing electric arc furnaces EF melting molten steel;
S2, employing ladle refining LF carry out refining to low-alloy steel CBM20 molten steel, comprise, and deoxidation also adjusts alloy composition by technical requirement;
S3, employing VD type ladle refining furnace carry out application of vacuum to low-alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise, addition 0.8 ~ 1.2kg/ ton molten steel of Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel; Argon flow amount 4-6 liter/min, pressure 0.3MPa, 5 minutes time;
S5, be cast into 5 tons of ingots, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red delivers to forged steel;
The typical composition of described low-alloy steel CBM20 is weight percentage C0.15 ~ 0.17, Mn0.75 ~ 0.80, Si0.24 ~ 0.28, S0.004 ~ 0.006, P0.005 ~ 0.15, Cr1.10 ~ 1.15, Mo0.26 ~ 0.28, V0.04 ~ 0.06.
The Advantageous Effects of low-alloy steel CBM20 microalloying method of the present invention is the quantity that effectively can reduce CBM20 steel ingot internal defect and internal tiny crack defect, the elevated temperature strength of effective raising low-alloy steel CBM20 and compactness, the flaw detection qualification rate after low-alloy steel CBM20 is processed brings up to more than 95%.
Accompanying drawing explanation
Accompanying drawing 1 is the step schematic diagram of low-alloy steel CBM20 microalloying method of the present invention.
Below in conjunction with the drawings and specific embodiments, low-alloy steel CBM20 microalloying method of the present invention is further described.
Detailed description of the invention
Accompanying drawing 1 is the step schematic diagram of low-alloy steel CBM20 microalloying method of the present invention, as seen from the figure, low-alloy steel CBM20 microalloying method of the present invention, adopt electric arc furnaces EF+ refining LF+VD type ladle refining furnace+die casting process to prepare low-alloy steel CBM20 steel ingot, it is characterized in that, after the application of vacuum of VD type ladle refining furnace, vanadium iron Fe-V and ferro-boron Fe-B is added in ladle, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low-alloy steel CBM20 is weight percentage C0.15 ~ 0.17, Mn0.75 ~ 0.80, Si0.24 ~ 0.28, S0.004 ~ 0.006, P0.005 ~ 0.15, Cr1.10 ~ 1.15, Mo0.26 ~ 0.28, V0.04 ~ 0.06;
Describedly in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, comprise, after VD application of vacuum, in ladle, add Fe-V50 and Fe-B; Addition 0.8 ~ 1.2kg/ ton molten steel of its Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel.
Further, low-alloy steel CBM20 microalloying method of the present invention, comprises the following steps:
S1, employing electric arc furnaces EF melting molten steel;
S2, employing ladle refining LF carry out refining to low-alloy steel CBM20 molten steel, comprise, and deoxidation also adjusts alloy composition by technical requirement;
S3, employing VD type ladle refining furnace carry out application of vacuum to low-alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise, addition 0.8 ~ 1.2kg/ ton molten steel of Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel; Argon flow amount 4 ~ 6 liters/min, pressure 0.3MPa, 5 minutes time;
S5, be cast into ingot, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red delivers to forged steel;
The typical composition of described low-alloy steel CBM20 is weight percentage C0.15 ~ 0.17, Mn0.75 ~ 0.80, Si0.24 ~ 0.28, S0.004 ~ 0.006, P0.005 ~ 0.15, Cr1.10 ~ 1.15, Mo0.26 ~ 0.28, V0.04 ~ 0.06.
Embodiment 1
Heat (batch) number 13V317, steel grade CBM20, ingot shape 5T, number 5;
Electric arc furnaces EF melting, oxygen blast is fluxed, oxygen pressure 0.4Mpa; Temperature 1595 DEG C of dark oxygen blast, oxygen pressure 1.0Mpa, sampling, skims 90%, temperature 1645 DEG C, tapping; Molten steel weight percentages C0.05, Si0.02, Mn0.05, P0.005, S0.095, Cr0.25, Mo0.02;
Ladle refining LF, adds lime 300kg, high carbon ferro-chrome 50kg, low-carbon ferrochromium 350kg, manganese metal 90kg, molybdenum-iron 70kg; After 30 minutes, add silicon calcium powder 40kg; Sampling, temperature 1651 DEG C; Add high carbon ferro-chrome 30kg, temperature 1679 DEG C, hangs out, slagging-off 40%; Molten steel weight percentages C0.12, Si0.15, Mn0.66, P0.006, S0.035, Cr1.05, Mo0.21;
VD type ladle refining, adjustment temperature 1665 DEG C, steam pressure 1Mpa, starts to vacuumize, and vacuum 67Pa keeps 35 minutes, vacuum 35Pa, broken empty;
Add vanadium iron Fe-V50 and ferro-boron Fe-B, adjustment temperature 1595 DEG C, adds Fe-V50,25kg; Add Fe-B, 12kg; Argon flow amount 4 ~ 6 liters/min, pressure 0.3Mpa, 5 minutes time;
Be cast into ingot, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red delivers to forged steel.
Embodiment 2
Heat (batch) number 13V668, steel grade CBM20, ingot shape 5T, number 5; The making step of embodiment 2 is identical with embodiment 1, and supplementary material addition, condition control also identical with embodiment 1 with Composition Control, are actually the replica test of embodiment 1.
Embodiment 3
Heat (batch) number 13V689, steel grade CBM20, ingot shape 5T, number 5; The making step of embodiment 3 is identical with embodiment 1, and supplementary material addition, condition control also identical with embodiment 1 with Composition Control, are actually the replica test of embodiment 1
The chemical composition of embodiment 1 to 3 low-alloy steel CBM20 is as shown in the table.
| Heat (batch) number | Steel grade | C | Mn | Si | S | P | Cr | Mo | V | |
| Example 1 | 13V317 | CBM20 | 0.15 | 0.75 | 0.27 | 0.005 | 0.005 | 1.14 | 0.26 | 0.05 |
| Example 2 | 13V668 | CBM20 | 0.17 | 0.79 | 0.27 | 0.005 | 0.009 | 1.11 | 0.27 | 0.05 |
| Example 3 | 13V689 | CBM20 | 0.15 | 0.77 | 0.24 | 0.005 | 0.014 | 1.1 | 0.26 | 0.06 |
As seen from the above table, adopt low-alloy steel CBM20 microalloying method of the present invention, after VD type ladle refining, when in molten steel, the lower and temperature of oxygen content is lower, add vanadium iron Fe-V50 and ferro-boron Fe-B and adopt argon gas to stir, make oxidizable V, B element is not oxidized or less oxidized, can when meeting chemical composition and meeting the demands, the quantity of effective minimizing steel ingot internal defect and internal tiny crack defect, improve elevated temperature strength and the compactness of low-alloy steel CBM20, flaw detection qualification rate after low-alloy steel CBM20 is processed brings up to more than 95%.
Obviously, the Advantageous Effects of low-alloy steel CBM20 microalloying method of the present invention is the quantity that effectively can reduce CBM20 steel ingot internal defect and internal tiny crack defect, the elevated temperature strength of effective raising low-alloy steel CBM20 and compactness, the flaw detection qualification rate after low-alloy steel CBM20 is processed brings up to more than 95%.
Claims (2)
1. a low-alloy steel CBM20 microalloying method, electric arc furnaces EF+ refining LF+VD type ladle refining furnace+die casting process is adopted to prepare low-alloy steel CBM20 steel ingot, it is characterized in that, after the application of vacuum of VD type ladle refining furnace, vanadium iron Fe-V and ferro-boron Fe-B is added in ladle, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low-alloy steel CBM20 is weight percentage C 0.15 ~ 0.17%, Mn 0.75 ~ 0.80%, Si0.24 ~ 0.28%, S 0.004 ~ 0.006%, P 0.005 ~ 0.015%, Cr 1.10 ~ 1.15%, Mo 0.26 ~ 0.28%, V 0.04 ~ 0.06%;
Describedly in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, comprise, after VD application of vacuum, in ladle, add Fe-V50 and Fe-B; Addition 0.8 ~ 1.2kg/ ton molten steel of its Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel.
2. low-alloy steel CBM20 microalloying method according to claim 1, it is characterized in that, the method comprises the following steps:
S1, employing electric arc furnaces EF melting molten steel;
S2, employing ladle refining LF carry out refining to low-alloy steel CBM20 molten steel, comprise, and deoxidation also adjusts alloy composition by technical requirement;
S3, employing VD type ladle refining furnace carry out application of vacuum to low-alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise, addition 0.8 ~ 1.2kg/ ton molten steel of Fe-V50, Fe-B addition 0.4 ~ 0.6kg/ ton molten steel; Argon flow amount 4-6 liter/min, pressure 0.3MPa, 5 minutes time;
S5, be cast into 5 tons of ingots, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red delivers to forged steel.
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